Question

a number is first increased by 20% and then decreased by 15% fing the net increase or decrease. does in make any difference if it is 15% decreased first and then 20% oncreased? ​

Answer 1

Answer:

No, it doesn't

Step-by-step explanation:

Let's say the number is x

Increase by 20% = x + 0.2x

Now decrease by 15% = x + 0.2x - 0.15(x+0.2x)

= x + 0.2x - 0.15x - 0.03x

2nd way, Decrease by 15% first = x - 0.15x

Now increase by 20% = (x - 0.15x) + 0.2(x - 0.15x)

= x - 0.15x + 0.2x - 0.03x

These two results are the same, so it doesn't matter which calculation you do first.

Answer 2

Answer:

Step-by-step explanation:

Let no. Be 100

Then no increased is 120

Now decreased 120-((15/100)×120)

120-18=102

Therefor net increased is 102-100=2